1915.] J. STEPHENSON : Indian Oligochaeta. 73 
the apertures. No setae are present between the male pores; the distance included 
between the centres of the apertures is about „5 of the circumference. 
The female aperture is single, median, on xiv, midway between the line of the 
setae and the anterior border of the segment. 
The spermathecal apertures are in grooves 7/8 and 8/0, surrounded by slightly 
whiter areas. They are considerably further apart than the male apertures,—about 
+ or à of the circumference. 
Internal anatomy.—The first distinctly recognizable septum is 6/7, though 5/6 
appears to be slightly developed. None are thickened. 
. There is a smooth rounded dilatation of the alimentary tube in segment vi, but 
its walls are soft, and it is therefore not to be reckoned as a gizzard. There are no 
calcareous glands; but the oesophagus is bulged in segments x—xiii, and the bulg- 
ings are marked by a transverse striation due to vascular channels. The intestine 
begins in xvi. | 
The last heart is in xii. 
The excretory system is meganephric; the nephridia are all in the same line. 
The testes are free in x and xi and have the form of finger-like lobes: the funnels, 
in the same segments, are of relatively considerable size, folded, and not (in the 
specimen dissected) iridescent. 
The seminal vesicles, in segments xi and xii, arise from the anterior septa of 
their segments. Those in xi almost meet over the alimentary canal, those in xii actu- 
ally meet and fuse. 
The prostates, of the ‘ Pheretima’ type, form a compact mass in xvili, not over- 
stepping the boundaries of the segment, but causing the septa to bulge somewhat 
both in front and behind. The duct is almost straight, is moderately stout and 
short, and has a transverse direction from the middle of the gland to its termi- 
nation. 
Ovaries and ovarian funnels, both of considerable size, occupy the usual position. 
The spermathecae are two pairs, large, and situated in segments viii and ix; the 
anterior pair, in the specimen examined, were larger than the posterior. Theampulla 
is a regular ovoid in shape; the duct is stout (in the posterior pair almost as thick as 
the ampulla), and about equal in length to the ampulla, from which it is marked off 
by a constriction. There is no diverticulum. 
Penial setae (fig. 15) are present, in length I mm., and in breadth, at the middle 
of the shaft, 20,; they form a considerable group, of six or more on each side. 
The shaft is straight except for a slight curve towards the distal end; this end shows 
a very slight bulbous swelling immediately proximal to the extreme tip, which is 
bluntly pointed. There are about eight rings of spines around the free end; the 
individual spines are of moderately large size. 
Remarks.—The present species appears to come nearest to P. koboensis Stephen- 
son (21), from which it is distinguished by the more anterior position of the first 
dorsal pore, the greater extent of the clitellum, the closer approximation of the sper- 
mathecal apertures, the presence of two instead of three pairs of vesiculae seminales, 
